Marker pen probe



FIG. 1 is a perspective view of the marker pen probe of the present invention with its transparent outer casing midsection;

FIG. 2 is a front side elevation of the marker pen probe of FIG. 1;

FIG. 3 is a back side elevation of the marker pen probe of FIG. 1;

FIG. 4 is a top view of the marker pen probe of FIG. 1; and,

FIG. 5 is a bottom view of the marker pen probe of FIG. 1. 

The ornamental design for a marker pen probe, as shown and described. 